R&S FSH series User Manual

80
PD 1309.6269.62-02
3.3.2 Setting the Reference Level
The level shown by spectrum analyzers at the
top of the measurement diagram is called the
reference level (REF LEVEL). To obtain the best
dynamic range from a spectrum analyzer, its full
level range should be used. This means that the
maximum spectrum level should be at or close to
the top of the measurement diagram (= reference
level).
The reference level is the maximum level on the
level axis (y axis).
Reduce the reference level by 10 dB to increase the
dynamic range.
 Press the AMPT key.
The softkeys for the AMPT menu are displayed
and the REF LEVEL softkey label is highlighted
in red, i.e. it is enabled for value entry. The red
value entry box at the bottom right-hand corner
of the measurement diagram displays the current
reference level.
 Enter ‘30’ using the numeric keypad and
confi rm the entry with the ‘-dBm’ key.
The reference level is now set to –30 dBm. The
maximum trace value is close to the maximum
scale value of the measurement diagram. The
increase in the displayed noise fl oor is minimal.
The difference between the signal maximum and
the displayed noise (i.e. the dynamic range) has,
however, been increased.
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R&S FSH series Specifications

General

Input Impedance	50 Ω
Display	640 x 480 pixels
Tracking generator	Optional
Interfaces	USB, LAN
Third Order Intercept (TOI)	+15 dBm typical
Input VSWR	≤1.5:1 (typical)
Input Connector	N (f)
Power Supply	100 V to 240 V
Frequency range	9 kHz to 3.6/8/13.6/20 GHz
Battery life	Approx. 4 hours (standard battery)